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[SystemZ] Fix applyFixup for 12-bit fixups 

Now that we have fixups that only fill parts of a byte, it turns
out we have to mask off the bits outside the fixup area when
applying them.  Failing to do so caused invalid object code to
be emitted for bprp with a negative 12-bit displacement.

llvm-svn: 288374
This commit is contained in:
Ulrich Weigand 2016-12-01 17:10:27 +00:00
parent c1835319c9
commit 55082cddef
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCAsmBackend.cpp
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@ -94,12 +94,14 @@ void SystemZMCAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
bool IsPCRel) const {
MCFixupKind Kind = Fixup.getKind();
unsigned Offset = Fixup.getOffset();
unsigned Size = (getFixupKindInfo(Kind).TargetSize + 7) / 8;
unsigned BitSize = getFixupKindInfo(Kind).TargetSize;
unsigned Size = (BitSize + 7) / 8;
assert(Offset + Size <= DataSize && "Invalid fixup offset!");
// Big-endian insertion of Size bytes.
Value = extractBitsForFixup(Kind, Value);
Value &= ((uint64_t)1 << BitSize) - 1;
unsigned ShiftValue = (Size * 8) - 8;
for (unsigned I = 0; I != Size; ++I) {
Data[Offset + I] |= uint8_t(Value >> ShiftValue);